# DLSS Ray Reconstruction crashes editor **URL:** \ **Category:** Rendering\ **Tags:** unreal-engine, Ray-Tracing, crash, Shaders, Blueprint, question\ **Created:** [October 21, 2025, 8:31am UTC](https://forums.unrealengine.com/t/dlss-ray-reconstruction-crashes-editor/2667132 "2025-10-21T08:31:50Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![OneNot](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/onenot/32/746410_2.png) [@OneNot](https://forums.unrealengine.com/u/OneNot)\ **Post date:** [October 21, 2025, 8:31am UTC](https://forums.unrealengine.com/t/dlss-ray-reconstruction-crashes-editor/2667132/1 "2025-10-21T08:31:50Z")
After updating my project to 5.6, it started crashing. I quickly found that the issue was Ray Reconstruction. I disabled it and the problem immediately went away. (Still using DLSS-SR and NIS sharpening). Now, sometime later, I’m trying to fix RR. I updated to the latest version of the plugin, but I still have the same issue. The error I get is: `Fatal error: [File:D:\build++UE5\Sync\Engine\Source\Runtime\RHI\Private\PipelineStateCache.cpp] [Line: 533]` `Shader compilation failures are Fatal.` The crash happens immediately after/during enabling RR via the `Enable DLSS-RR`node. That line in the error is for `HandlePipelineCreationFailure`, so something to do with shader compilation I suppose. I’m mostly working with blueprints on this, at least for now. For the record, I am first ensuring that HW Lumen is on and checking that `Is DLSS-RR Supported`returns true, before attempting to enable RR. There is also the case of the `r.Lumen.Reflections.BilateralFilter` issue. The DLSS documentation mentions an issue with UE5.2 and UE5.3 that necessitates setting this to 0 via engine config because setting it at runtime causes a crash. This was fixed at some point by Epic, but Nvidia still expects you to handle it yourself (at least as of when I last checked on whatever was the newest version of the DLSS plugin before UE5.6) even though you can change it at runtime now. Regardless, for the purposes of debugging RR, I just set `r.Lumen.Reflections.BilateralFilter=0` in the config for now, so that I can rule out this issue. Any idea why RR crashes the engine? **Edit:** > **Some more logs** > > ```auto > [2025.10.21-08.59.40:997][118]LogD3D12RHI: Error: Failed to create pipeline state with combined hash EA98E289955B3282, error 80070057. > > [2025.10.21-08.59.40:998][118]LogD3D12RHI: Warning: Failed to create graphics PSO with combined hash 0xEA98E289955B3282: > > AlphaToCoverageEnable = 0 > > IndependentBlendEnable = 1 > > RenderTarget[0] = { 0, 0, 0x2, 0x1, 0x1, 0x2, 0x1, 0x1, 0x0, 0xF } > > RenderTarget[1] = { 0, 0, 0x2, 0x1, 0x1, 0x2, 0x1, 0x1, 0x0, 0xF } > > RenderTarget[2] = { 0, 0, 0x2, 0x1, 0x1, 0x2, 0x1, 0x1, 0x0, 0xF } > > RenderTarget[3] = { 0, 0, 0x2, 0x1, 0x1, 0x2, 0x1, 0x1, 0x0, 0xF } > > RenderTarget[4] = { 0, 0, 0x2, 0x1, 0x1, 0x2, 0x1, 0x1, 0x0, 0xF } > > SampleMask = 0xFFFFFFFF > > FillMode = 3 > > CullMode = 1 > > FrontCounterClockwise = 1 > > DepthBias = 0 > > DepthBiasClamp = 0.000000 > > SlopeScaledDepthBias = 0.000000 > > DepthClipEnable = 1 > > MultisampleEnable = 1 > > AntialiasedLineEnable = 0 > > ForcedSampleCount = 0 > > ConservativeRaster = 0 > > DepthEnable = 0 > > DepthWriteMask = 0 > > DepthFunc = 8 > > StencilEnable = 0 > > StencilReadMask = 0xFF > > StencilWriteMask = 0xFF > > FrontFace = { 1, 1, 1, 8 } > > BackFace = { 1, 1, 1, 8 } > > InputLayout.NumElements = 2 > > InputLayout[0] = { "ATTRIBUTE", 0, 0x2, 0, 0, 0x0, 0 } > > InputLayout[1] = { "ATTRIBUTE", 1, 0x10, 0, 16, 0x0, 0 } > > IBStripCutValue = 0x0 > > PrimitiveTopologyType = 0x3 > > NumRenderTargets = 5 > > RTVFormats[0] = 0x1A > > RTVFormats[1] = 0x1A > > RTVFormats[2] = 0xA > > RTVFormats[3] = 0x29 > > RTVFormats[4] = 0x29 > > DSVFormat = 0x0 > > SampleDesc = { 1, 0 } > > NodeMask = 0x1 > > Flags = 0x0 > > ``` Everything else seems same as without RR, so this is the relevant part of the log that prints immediately as `Enable DLSS-RR` is called. I enabled `r.ShaderDevelopmentMode=1` so I assume that last part of the log snippet I added is the shader that fails, but that doesn’t really tell me anything… ---
**Author:** ![brs-sebascova](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/brs-sebascova/32/1052483_2.png) [@brs-sebascova](https://forums.unrealengine.com/u/brs-sebascova)\ **Post date:** [October 21, 2025, 2:26pm UTC](https://forums.unrealengine.com/t/dlss-ray-reconstruction-crashes-editor/2667132/2 "2025-10-21T14:26:40Z")
Hello there @OneNot! Checking around the community, the DLSS failed pipeline error you are getting is usually related to a graphic conflict, either with the active DX, or the current video drivers in your system. Please test the following steps: - First, the most usual solution, perform a clean install of your current drivers using any free uninstaller tool, then update to the latest version. If available, please use Developer drivers. - Then, ensure your OS has the latest updates installed ,as well as your DLSS plugin version. Confirm the one you are using is compatible with your UE install. - Once all updates are done, if the issue persists, the next step is to perform a cache clear in your project. Go to it’s main directory, and delete folders Saved, Intermediate, and DerivedDataCache. After that, restart your project, and allow the shaders to recompile. - At this stage, you can also try switching between DX11 and DX12. - Finally, if the problem is not resolved yet, it could be tied to the project itself. In order to know this, open a blank project, add the same DLSS plugin build, and test if the issue re-appears. For further methods to test, please check the related scenario below: > [@LogD3D12RHI: Error: Failed to create pipeline state with combined hash.- Crash in editor and packaged builds (Source Build of Engine)](https://forums.unrealengine.com/t/logd3d12rhi-error-failed-to-create-pipeline-state-with-combined-hash-crash-in-editor-and-packaged-builds-source-build-of-engine/1949177): > > Im using a source build of UE 5.4.3, I just setup baked lighting for my level. Does anyone know why after a minute or so of having the level open, the engine will crash with the following error. this also occurs in packaged builds for windows and android (android device is a quest 3) fatal error: [File:C:\Unreal Engine\UnrealEngine5.4-Source\Engine\Source\Runtime\RHI\Private\PipelineStateCache.cpp] [Line: 419]Shader compilation failures are Fatal. Ive attempted: Recompiling the Source buil…